Quiz: Energy and Entropy

1. The first law of thermodynamics states that energy is
a. increased during any process
b. decreased during any process
c. conserved during any process
2. Which of the following is not a major form of energy for chemical purposes?
a. exchange of heat with the surroundings
b. external work due to changes in pressure or volume
c. chemiluminescence
3. The internal energy is often called __________ because it is the result of all the motion of the particles and the forces between them.
a. chemical energy
b. radiant energy
c. kinetic energy
4. For a given chemical reaction, if there is no work done on or by the reaction, then there must be a change in
a. pressure
b. volume
c. internal energy
5. For an exothermic reaction in which no work is done on or by the reaction, the internal energy must
a. increase
b. decrease
c. remain constant
6. The second law of thermodynamics relates to
a. enthalpy
b. free energy
c. entropy
7. Entropy is a statistical measure of
a. disorder of a system
b. order of a system
c. heat of a system
8. If a chemical reaction is spontaneous, the total entropy of the chemical system and its surroundings
a. increases only if the reaction is exothermic
b. increases only if the reaction is endothermic
c. always increases
9. The preferred direction in nature is toward
a. maximum entropy
b. minimum entropy
c. zero entropy
10. The two forces that drive chemical change are
a. enthalpy and free energy
b. enthalpy and entropy
c. entropy and free energy
11. Standard entropy is measured at
a. 25°C and 1.0 atm
b. 100°C and 1.0 atm
c. 25°C and 2.0 atm
12. The entropy of a chemical reaction is calculated by
a. Σ(entropy of the products) − Σ(entropy of the reactants)
b. Σ(entropy of the reactants) − Σ(entropy of the products)
c. entropy of products × entropy of the reactants
13. If Δ S is calculated to be positive, there is greater disorder in the __________, which would drive the reaction in the __________ direction.
a. reactant(s), forward
b. product(s), forward
c. product(s), reverse
14. What sign of entropy would tend to prevent the reaction from occurring?
a. positive
b. neutral
c. negative

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